Filter



P 4, 1934- H. w. SCHMEUSZER 1,972,322

FILTER Filed Oct. 27, 1932 2 Sheets-Sheet 1 I Inucnfor f7owg a Wscmeuszer P 1934- H. w. SCHMEUSZER 1,972,322

' FILTER Filed Oct. 27, 1932 2 Sheets-Sheet 2 J a K Inventor fimrdwckm easz er Patented Sept. 4, 1934 STATES raresti-FICE 2 Claims.

The present invention relates to a filter, and more specifically, to a filter especially adapted to be used in connection with radio circuits and the like to filter out static and other objectionable interference.

()ne of the objects of the present invention is to provide a filter which may be connected in the antenna circuit in such a manner. that interference, such as static or the like, is eliminated.

Another important object of the invention is to provide a filter of the class described which may be used for filtering objectionable interference and the like in loudspeaker circuits, or in any other electrical circuits where such objectionable interference is present.

Another important object of the invention is to provide a filter which may be adjusted to filter out the objectionable interference such as static or the like, without interfering or af- 20 fecting the desired incoming signal.

The present invention contemplates the provision of a filter adapted to be novelly connected in the radio circuit or the like, which includes a container having a liquid solution of acid, a paste, or the like therein, and a plurality of spaced depending electrodes, one of the electrodes being connected to the antenna, another elec trode being connected to the antenna circuit of the radio receiver and the third electrode being connected to ground.

In the accompanying drawings, forming a part of this application and in which like numerals indicate corresponding parts throughout the same,

Figure 1 is a vertical sectional view of the filter,

Figure 2 is a horizontal sectional view of Fig. 1, taken on line 2-2 of Figure 1,

Figure 3 is a horizontal sectional View of the container as illustrated in Fig. 1, taken on line 3-3 thereof,

Figure 4 is a diagrammatical view illustrating one manner in which the circuit maybe controlled by means of a variable resistance,

Figure 5 is a diagrammatical electrical view showing a further modified means of controlling the electrical circuit by a variable inductance,

Figure 6 is a diagrammatical electrical view illustrating the manner in which the filter is connected in a power input for a radio receiving set.

Figure '7 is a diagrammatical electrical view illustrating the manner in which the filter is connected in the antenna circuit and to the radio receiving set.

In the accompanying drawings, wherein for the purpose of illustration there is shown a preferred embodiment of the invention, the numeral 8 designates a jar-like container constructed of glass or any other insulating material which is disposed within a rectangular-shaped housing 10 constructed of electrical conducting material, such as copper, brass, or the like, and is provided with a pivotally mounted top 12.

Within the housing 10 there is firmly secured to the inner side walls thereof a frame 14 and interposed between the inner sides of the frame 14 and the container 10 there are arranged a pair of right angled spring members 16 which are adapted to abut against the upper side of 0 the top 18 of the container to secure the same in position.

The top of the container 18 is constructed of bakelite or any'other non-conducting material, and depending therefrom and secured thereto by means of screws 20 are the cup-shaped electrodes 22 and 24. As illustrated in Fig. l the cup-shaped electrode 24 is spaced from the electrode 22 and disposed within and depending from the top or cover 18 is a third electrode 26 which is of cylindrieal shape and spaced from the central electrode 24. The electrode 26 is secured to the nonconducting cover plate 18 by means of a binding post 27 and the electrodes 22 and 24 are provided with binding posts 30 and 32, respectively.

The electrodes are constructed of lead and the container is filled with acid or a caustic paste composed of potash and acid, depending upon the circuit in which the filter is desired to be used. If the filter is to be used in the antenna circuit acid or a caustic paste compound is used while if on the other hand, it is desired to use the filter in a power line circuit it is more advisable to use a mercury filler for the reason that it will not cook and give ofi fumes when an electric current is passed therethrough. Obviously, any type of filler may be used and the invention is not limited to the specific fillers herein mentioned.

The electrodes 22 and 24 are provided with spaced apertures 34 to permit the filler to flow between the electrodes. If so desired, the outer electrode 22 may be in the form of a sleeve as distinguishecl from being cupped shaped and although by way of illustration the electrodes are shown to be constructed of lead it is to be specifically understood that the invention is not limited to lead alone, since other metals may be employed to serve the purpose.

Adjacent the outer rectangular box-like covering 14 there is secured by means of spaced straps 40 and 42, an inductance coil 44. The winding 46 of the coil is wound upon a cylindrical hollow tubing 48 constructed of di-electric material or the like and its ends are secured to binding posts 50 and 52. The winding 44 is surrounded by a casing 54 of insulating material. The winding 44 may be of any size copper wire and may consist of any number of turns depending upon the circuit in which it is used. The binding post 50 is connected to the binding post 30 of the electrode 24 by means of conductor 56 which extends through an opening in the cover 10 and is insulated therefrom by means of a non-conducting bushing 58. Similarly, binding post 32 of electrode 22 is connected to the antenna by means of conductor 60 which extends through the covering 10 and is insulated therefrom by means of bushing 62.

is connected to the antenna terminal A of a radio receiving set by conductor 64 and it is important to note thatthis conductor is wholly enclosed by means, of a shielding conduit 66 constructed of lead, copper, or any other electrical conducting material. This shielding prevents the Pick up of static currents and the like by means of the conductor 64. It is to be understood that the shielding casing 66 is grounded by Way of the shielding cable cover to the set shielding, or if the set shielding is not grounded, a direct ground conductor connected to the shielding cover may be employed.

The cover 18 as illustrated in Fig. 2 is provided with an opening 31 through which the filler may be poured into the container and by the same token, any gas or the likeformed in the container will be emitted.

Referring now to Figure 7 there is shown the manner in which the filter is connected in circuit with the radio receiving set. The electrode 22 is connected by means of the conductor 60 to the antenna, the central electrode 24 is connected by means of conductor 56 to the inductance coil 44 in circuit with a variable condenser 43 which is connected'to ground by means of conductors 41.

The conductor 41 is connected to the ground binding post G of the radio set by means of the conductor 39 and the central electrode 26 is connected to the aerial binding post of the receiving set by means of conductors 64. In this particular circuit a variable condenser 43 as illustrated in Figure 4 is employed to control the circuit.

However, it is to be understood that a variable inductance 37, as illustrated in Fig. 5, may be inserted in place of the variable condenser 43, if so desired.

Referring to Fig. 6 the input energy which operates the receiver is filtered through the filtering device and the reference numeral 33 designates a direct current generator, the brush terminals of which are connected by means of conductors 70 and 72, respectively, to the electrodes 22 of the filtering device. The central electrode 26 of the filtering device A is connected to the binding post 74 and the central electrode 26 of the filtering device B is connected by means of conductor '78 to the terminal 80. The electrodes 24 of each filtering device are connected in series by means of conductors 82 through the inductance coils 44 of each filtering device and condenser 83 which is connected to ground.

Referring to Figure 7 it will be seen that the incoming energy from the antenna which includes both the radio and the interfering static current must pass from electrode 22 through the filler between electrodes 22 and electrodes 24: through the shielding electrode 24 and through the filler between electrodes 24 and 26 to the electrode 26 and then into the radio receiver. In this manner, the static impulses are led out of the filter by electrode 24 through the coil 44, the coil permitting the radio current to pass and yet provide the means to filter the undesired static or interfering current to the ground.

While there is shown only one preferred embodiment of the invention it is to be specifically understood that the same is capable of various modifications and changes without departing from the spirit and scope and it is intended therefore that only such limitations shall be imposed thereon as are indicated in the appended claims or in the prior art. It is also to be understood that within the purview of my invention any appropriate method of control in addition to the three methods described may be used; that any appropriate type of filler may be employed within the scope of my invention; and that in the practice of my invention and without departure therefrom the container 8, Figure 1, may have the top seal d on or be built all one, of glass or other appropriate material so that a vacuum or gas may be maintained inside the cone tainer above the filler level, this being materially advantageous because it will prevent spilling of the filler.

Having thus described the invention, what is claimed is:

l. A filter of the class described, comprising a container constructed of insulating material, a cover for said container, a metallic cup depending from said cover into said container, a binding post secured to said cup, a second cup depending from said cover, into said container and being spaced from said first named cup, a binding post secured to said cover and being electrically connected to said second named cup, an electrode depending from said cover into said second named cup and being spaced therefrom, a binding post electrically connected to said electrode, a liquid in said container, said first and second named cups being provided with a plurality of apertures therein.

2. A filter of the class described, comprising a container constructed of insulating material, a cover for said container, a metallic cup depending from said cover into said container, a binding post secured to said cup, a second cup depending from said cover into said container and being spaced from said first named cup, 2. binding post secured to said cover and being electrically connected to said second named cup, an electrode depending from said cover into said second named cup and being spaced therefrom, a binding post electrically connected to said electrode, a liquid in said container, said first and second named cups being provided with a plurality of apertures thereimand a coil secured to said container, having one terminal connected to the second depending cup and the otherterminal adapted to be connected in series with a variable resistance and the ground. I

HOWARD W. SCHMEUSZER.- 

